Some older vehicles have front brake limiting valves with "normal" and "slippery" settings. Setting a brake limiting valve to "slippery" reduces the vehicle's stopping power, so a driver should make sure the valve is in its "normal" position. Front wheel braking has proven to be effective in all driving conditions.

Set the control to the off position.

Set the control to the neutral position.

There are two air brake systems in a dual air brake system. The systems share a set of brake controls, but each system has its own tanks, hoses, and lines.

Each system has its own air tanks.

Air tanks are shared between both systems.

Each system has its own air tanks.

You must designate which system you are using.

Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.

Because compressed air contains some water which must be drained from the tanks

Because the air gets old and needs to be replaced

Because compressed air contains some water which must be drained from the tanks

To allow for a change in air pressure

To remove bad air from the tanks

In general, a tank endorsement is required to a drive tank vehicle used to transport liquids or gases. This applies to both hazardous and non-hazardous materials.

Used when transporting both liquids and gases.

Only required when transporting gases.

Only required when transporting liquids.

Used when transporting both liquids and gases.

Optional when transporting hazardous materials.

If the low air pressure warning light turns on, you should stop and safely park your vehicle as soon as possible. Controlled braking will be possible only as long as enough air remains in the tanks.

Braking will only occur if there is enough air in the tanks.

You can brake 14 times before the air in the system runs out.

You should continue to drive normally and check the brake system when it is convenient.

You should continue driving, but turn the emergency flashers on to warn other motorists.

Truck tractors with air brakes that were manufactured on or after March 1, 1997 are required to be equipped with Anti-Lock Braking Systems (ABS). ABS is required in any other type of vehicle with air brakes that was manufactured on or after March 1, 1998.

Anti-Lock Braking Systems (ABS).

Air Brakes Endorsement Test | Wisconsin 2025 #1 Page 4 of 4

Train for FREE online with our Wisconsin CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a WI Class A/Class B driver license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.

Number of Question 25

Passing Score 20

Number of Tests 20

Air Brakes Endorsement Test | Wisconsin 2025 #1 Page 4 of 4

19 . To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

20 . In a dual air brake system:

21 . Why do you need to drain air tanks regularly?

22 . A tank endorsement is:

23 . If the low pressure warning light comes on while you are driving:

24 . Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:

25 . Braking mechanisms are located inside:

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